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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '403a7ba4a3c1ce0e5e6fad4fe944e39fae66fad6625b3a1f1cc8fc04dc9795af' 
  AND token = 'yvQMGBrywPBde0+I3sPS7XWkuk74/X9vA7wFh5a1CQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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