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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84bd7022b31fd9a50c6bd63c1df2c6441295fd0200ef5a323c8dfcabd00d8b4f' 
  AND token = '0LyydDTSNirCarZRGSFWix1y7WuYq7AQTxJfnh56ry0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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