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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a63b7bbc17ff3219b036185fbf664a890538487cadb42ed8ad52f3d22110cb9' 
  AND token = 'hJzBSOIyqehxmuJNOBfEFwBBd8SlkzmjBB7N052dWNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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