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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67e128f07bbf876764b4af51015a0f85df778117b8107e3a83b48c49d2358a41' 
  AND token = 'eJsDpDIaRXgkIe+Hk0cFBpsdxOZ9PZWRojnecK8sY/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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