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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8e728b3fb50db6c5c6c3b353ae0114784fc78075bd686115b1e0b7d13f404e0' 
  AND token = 'veSI3sJOAjSg3XoU8yCx8Te1QtzFLyAKBjF1SCWx1UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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