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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7208c54e550ce97f42223756fa810fe199c49e444f883d59eac28419fa60e0cc' 
  AND token = '86ocBnhmG79JDxYZry1lqs8Gp9jPMmaWES3jnrBMuFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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