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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9c88a1e47a23f1c4b7b34b84f27a09f5fff25d55b1713e25c01c775955f2b77' 
  AND token = 'D4QI6hzByyLNGetHsZ6ehQbPRkWAUf4mZ28uW4pdWVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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