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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b11ac65fa729b880fc35f0d23af07b8b38fb27da4ec1b5e1dde21f8a5d6ae295' 
  AND token = '9qLRxe2IAPEr84ZnXB3Q3OXaCWja6NKJIRywhtLCIM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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