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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58c072744f7dca6060ca2496e2966a6cd4ce4ba2708fd1cdd8e1386f6651c1e7' 
  AND token = 't35qOrVU79nUuoccO0PsxMFEQpukR1OQLvk+QjFhjnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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