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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67babbb9043ef3fb8a25e22e3183824dbae384bd84e965dcf6faea0e1ad4805c' 
  AND token = '3SnQANwanaYYIECijALhhf5AKDsukk8OPc9oz1/MqcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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