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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5752504fdfdd9e4cd1282d85ace319bb712594a7d14d976fc082f697d7d29326' 
  AND token = '7PGVpu+p2NYaxyNXcaX5hNy1oalnMMqn/5nkDrRbfCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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