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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21f23b37decea1ea9119b969eca15a90711cddacc396c0ac802fd755eedc5098' 
  AND token = '+o4lpPhrN6ykSzOybCSVcVzCXIxlQh9rNir0g5s3/pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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