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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4280849911315b69c2c9cc54fe1c7d2d64f9727ff817d1791472c0436182cf49' 
  AND token = 'kNsWo0e5KUUGmqIc5T4Mg14l5vS4XaWL4xa90dRMQag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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