SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d358bc22e56c640c9394eb90e15dd5c147365f6f7c68a47bd5f8a85246b2f8d' 
  AND token = 'fqMLew/+Xo3FlL9b/5MAYWIhAFj5TetOJWxPSMPt2mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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