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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1ea483c641f269f313804bcb142fd828f3bfeec6a68493485671b1885a1cacf' 
  AND token = 'mwYKcc2/fv+ymL9py0AOPB8Uhqi0OXeW6CXL9UwRahw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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