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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e96d7a5f9bde7112249de6654b547990f1be3c687bb7d4d70b253e40ad4b0fc5' 
  AND token = 'qFd+FsEG8ZKFHCba4ccDvxPc23wlKV6t8pU/b3A25Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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