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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96f316170b4348b102462aa049fdbdf74593d159b253535bbc4302b46de4a6ee' 
  AND token = 'fYR6zfxy5Nna+ZsyV/yAvjH6aR0ej1+oINMDOoD1yuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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