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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c34a7b122502000653fff69c7d9fb22f86abb7b257a63ff3b29d651b14583432' 
  AND token = 'D0/ALAfV8agEBOMsXJPvRSek9l7OVJgcLfy9oC0Ont4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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