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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff0dbb8947d74c41299e8c808b010ea12875a47b23b3824d41b7693ca76afd6a' 
  AND token = 'Zarmm9nuvLrDupTTUFMwUA1r8ZciiPm7OEYJDc6mvSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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