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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60fe6fdf64a170f3827e5b6865355e580a06d79d718569874898e4bb3de56a8b' 
  AND token = 'N4ZQJnfJZ3S7aZ1MWlfo9qhZnZ9aO86BuqLR3ZVEqLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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