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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92aad142f55eb4549eb5c318f987e379eb19cb881b42b83a7d654b0fe5c16879' 
  AND token = 'y0fNRFcFVFy5ozlwCQO9A+Tl0m9l6ttAcCDtcv9Idlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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