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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45f1aff3fab886fca837c36bd981210cd7101863473b690ac26ae2bd8f73b528' 
  AND token = 'yuS0y/c5ypfl1Y1rDhQf2WJ1w8x6DC37MRdb7uzMewI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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