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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c545163b67cbaf02f8fc665a6a4261fb1b2a72b4f7cca920fb154bfc28989b12' 
  AND token = 'a9QEHK9GwF+1V+nrCabh1lm5Zay2WK9uPYCqxx6/YIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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