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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fb3d96a05bc9bf2acdcec6a6308abdd4b3974c985ea28f77d4e78d3bd10a485' 
  AND token = '3KhOhkwIpw4yFLFy2viyo+IvPxlFICysl678ROGyUDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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