SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5db0b5c0574e0271cd7112f8a950af16f530e0a7b783a8797207ea0724515534' 
  AND token = 'OfSomJB5xZfJygL1R6LF7Z/q9WzrLpj65GCDnvsaNJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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