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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55a51aa72fb5456a5d4de29a5e1b5b615becca0665e5d8b66452c6fa8131f6b0' 
  AND token = 'e1mRo8lGn7Ifkdh/+6/Fv7H1t8xjqP5ZDcjy0Z6q4jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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