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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21f4661a1340a3a7260b229270d0806e09fd1c585b6ce6b91f4810cfdf896426' 
  AND token = 'sXr/Ldvlo3JFRwr6rrofX2Dg/vkWBb09kLHXoizvvgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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