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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e75c21ea717fef8155e2ce1d38443460770cac564836622b97bb5648ab6f3db2' 
  AND token = 'kK3dTZG+hr8oqx8Chmm4VkcdWR41BMy57GKj0ItXS3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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