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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6605fe4da408d2e4e5f7caad369c2d9c69cc4a308778a8d0d8211a11cc5d8822' 
  AND token = 'j5JUUEC7T7enpxFYMGJtwD8+Xd0J0/htw0uusHoIUeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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