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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '995257bc0f87d8f71e785b92383ee38b75f5aa75e48eceb561733a5b77bccda6' 
  AND token = 'T+h/gNhitGd3a9qDaSeDJpYdsXlNk+Iu6LxEh0TLM+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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