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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9769de483ee267f336ece44c39eda1c3aec542fb9ff9e94dbd84924b18f7b4e4' 
  AND token = 'BuVEv708jqVrIY7uE1FBS1yoyCEzkUAzyWlL2GUlu74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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