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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02e6cf879c2f43ea163afe66e3e5f7c4001e541bc80328c01317541ab464d638' 
  AND token = 'kpZnFeFQXkaHIQg6uR3BDmcnN+8Uc2f+kM7E7/G0owI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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