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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '886a679fa6a46e13d02f657c0c46c198dc5eafba41fb530487b175f1e13dcdc6' 
  AND token = 'cTyDAwRsqusIO4jMIvmxNzqO/k3TkQtwuIwOWJtTTtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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