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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea5fe518f5da583a67a4dc2f624030bece42d6c5316ae70b65ba44da0e4fca77' 
  AND token = '4biVMCeIBmRfelGAySA88RXwXlr34mZ5lBRP8ZU/qPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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