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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de550b8d44fdc55e2c594628e143721808f9ed1f5306200e9eb4b44d27e5e6c4' 
  AND token = 'Q6YXepCx6w0XqK+njRHjLUtENPqhddOyXMtVDgnExt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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