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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14651d188b78bc376be146968739c53835e281c6f437bcee0850430a9668b90e' 
  AND token = '+VlMfKG+g4xJRv5PdhD5v5ocvKee3OGLcIBTgdsH9f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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