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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cd6941b10d28f2505339057a55d694ebce8c23301a4ba40d11d12355d78708c' 
  AND token = 'wKvZ5q5Ba07GrU5fCrC2UXXMNW9sBpsEEWWX5Cv5b6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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