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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09cc34c329ea04779d70e91a9645c97df92714f7e1f6bb8958e2148b8a91ed60' 
  AND token = 'sosLjpDDrvFaanfZB4jW2dDyfnEZlGI78aIv7olZLFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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