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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90deee7709b67340e5671d8686d02b49eae4cee7844291c070a6ad0c81d1fe01' 
  AND token = '+izHOGo+TyHFRFj98liVYYVXaCdBN0CduWuts1XkGRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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