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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '752b625d970c1531ad6f333aaa15e6ae60ce97bd15645bd948a1da2101a5504f' 
  AND token = 'xi3PzgCrhmns/JN0ix+dzyyWA6Ni4ifJxbuFPhJ6kro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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