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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '532f047408ec99daa10827be07b6b46a7a10342906c181188157b7b6f73efba0' 
  AND token = 'pIpUeW4RUTWJB7fOPvAJpVQVB1tktFvD6e2J3N1XBCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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