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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77e7278e27fc97d7d37af6ab7752caf1fd2d5be97e65b1f1ada7300cfb803eb1' 
  AND token = 'Y9j5f7PG2LtuyqdZ1CYQpXscVPxa1gEVplk1QxULhxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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