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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae5f9676cb7b6d71cb6a80b74bcbbf33e8a6ea5481a87b057c72da3cfb74e1e4' 
  AND token = 'TqqEjCI3xgReX1/cnqsJCgp3NL7cWD9j9xgmNzZ/9vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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