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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd38ef563eb8deb5ff40d4897921a37d52487690e587493f7b0ecf873108a6412' 
  AND token = 'YRMCYdjicBUmy2lXMRIpThS8kyQmplsTrhE+DX5RUqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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