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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '153d5e201099cbb7cdc55e815ac6a02979b1349f979a78a1653a5477f246be7b' 
  AND token = '5Vfjgl6ymGl07oqGbtvpa5eQjizObTppr78nY8JKiCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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