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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79d3f283580ce650133f1fadee76e1809e8c296479acd0c2d10dab38113945ec' 
  AND token = '1norja5xfNKS0BhOsDP+2ix5tsQXLMaJ/muVRtfBPmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00139

JSON explain

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