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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3311007971552f7fcc655b911ad5f6e53d602982799616ea1f1db325ba1bb62' 
  AND token = '3h594YSawGzly2pSWceOBQwM8ixhsbcmcbBZ4PBxiNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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