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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9eb71e95e3d9dd9250f9bda8891679ca3daa7926c321928fb44a3971e8d21589' 
  AND token = 'k34WGaHovFIc4eFxeW2xSjJ4WgfAWegYyRZNZZLOE+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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