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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff3e6dfd3459d32d57d936e111ed7775e606de049f736cf3abf53c0fdb91952b' 
  AND token = 'Z748wX3UGDuBq267fB3LVlKzAB6Vd2vDy2y34LBEz1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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