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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3099f4f95708bc5d341f3a3cff9c1c36a082953382505013ce8882668dd165e' 
  AND token = 'xLcS8V4bGQIa5P1kbLa1uu+n84r/w3qCF7bbm8PnbVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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