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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a3e4a75fc1f3d8503b8b647bbdbbd32b678251ed9e1fd79b76705eb9f7462c5' 
  AND token = 'tDOuF68rSVGophYtNQBPVtVVo1l37SNO+Q4ErhNrr8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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