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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a5ab61ed5232f2a2c7fe6e56425a31051c1907a51daa53a5e497ea562b42821' 
  AND token = '+AYuTU82taP+cMZeGyJd0Slae5zqaRjZUQ0E9FkOHQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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