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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30158460aacab41317a6c46c1d94e0440b3c478a1ffa3384de4848c1dbed4f91' 
  AND token = 'FdDcAPvCELQ6VAPSSp2BVmfTM/fMQmp5Gp9/JZ6tF+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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