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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31254ad98acc58bca6a5cf1e343efbab2dd817ad213297980875fbaca46773d2' 
  AND token = '9Gx3g34LoF3JU1mudEpBoVfqEyjf2KkeRMqe6Wv0w60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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