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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9d02e643c6ea57e141ff67315fa2500eda9e46e329084368f713d4a6c4e9376' 
  AND token = '6Alpnf2s/+t3/aM58mqv6ze6GdFKRKAeVKTHKLYJTvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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