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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06c32a14a4943288adfd416f27946e39e8175907b4da85ae54b6417f0a201bce' 
  AND token = 'UDCQWjXf2g46G9d2zyANpCyJ3ZMBk36z29toUHA5fdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}